Mechanism and Conditions of the Polygonal Wear of Vehicle Tire  

作　　者：Shuguang Zuo Tianxin Ni Xudong Wu Yong Li Xianwu Yang 

机构地区：[1]School of Automotive Studies,Tongji University,Shanghai 201804,China [2]NVH Department,Changan Auto Global R&D Center,Chongqing 400023,China

出　　处：《Automotive Innovation》2018年第2期167-176,共10页汽车创新工程（英文）

基　　金：The authors acknowledge financial support from the National Natural Science Foundation of China(Grant Numbers 51375343,50775162 and 51305303).

摘　　要：Polygonal wear seriously decreases the lifespan of a tire of a passenger car and adversely affects vehicle dynamic safety.The present paper builds a model that reflects the dynamic contact characteristics of the tire and reveals the mechanism and conditions of polygonal wear of a tire.The model describes the dynamic contact behavior of the tread block and considers the characteristics of dynamic friction between the road and tread of a rolling tire.Conducting numerical bifurcation analysis,the paper reveals the conditions for self-excited vibration of the tread,i.e.,the improper combination of the vertical load,wheel slip angle,tire pressure and vehicle speed considerably strengthen the lateral self-excited vibration of the tread,which is the direct vibrational source of abnormal circumferential polygonal wear.The polygonal wear of a tire occurs when a vehicle travels for a certain long distance at a so-called polygonal wear speed.The polygonal wear speed should induce lateral self-excited vibration on the contact tread of the tire and the frequency of the lateral self-excited vibration should be divisible by the rolling frequency of tire that is determined by the polygonal wear speed.Visible polygonal wear requires that the vehicle travels at a certain polygonal wear speed for a minimal distance to produce a stably developing polygonal wear pattern even for subsequent driving at variable speed.

关 键 词：Tire polygonal wear Tread contact model Self-excited vibration Wear calculation Bifurcation analysis 

分 类 号：TG1[金属学及工艺—金属学]